synchronized 互斥锁
可以保证变量在作用范围内不会被其他线程改变
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class Cc {
func method(number: Int) -> Int {
return number + 1
}
}
func synchronized(_ anObj: AnyObject, closure: () -> Void) {
objc_sync_enter(anObj)
closure()
objc_sync_exit(anObj)
}
func MyMethod(anObj: AnyObject!) {
synchronized(anObj) {
if anObj is Cc {
print("is cc")
if let a = anObj as? Cc {
print(a.method(number: 3)) //4
}
}
}
}
let cccc = Cc()
cccc.method(number: 2)
MyMethod(anObj: cccc) //3
